class_docstr: Hard sampler.
code: def _wrapped_model(self):
      return self.model
  
imports: from __future__ import annotations
  import collections
  import random
  import typing
  from river import base, linear_model, optim, utils
label_desc: Use image node_id 2 for calling the HardSampling obj's underlying member method code with example usage: obj._wrapped_model() and returns: self